Skeleton reenforcement



July 19, 1932. I LACHMAN 1,868,108

SKELETON REENFORGEMENT Filed Dec. 28, 1929 2 Sheets-Sheet l 1 J y 19,1932 I M. LACHMAN 1,868,108

SKELETON REENFORCEMENT Filed Dec. 28, 1929 2 Sheets-Sheet 2 Patented July 19, 1932 MAURICE LACHMLAN, OF NEW YORK, N..Y. v

SKELETON REENFORCEMEN '1 Application filed December 28, 1929. Serial Ke. 417,054.

My invention relates to the construction of open or skeleton grating or metal work and more particularly has to do with the method of producing and the construction of a skeleton 'reenfor'cement suitable for use as an imbedcled part of the surface of a pavement,

an edge of said skeleton work forming a part of the wearsurface while the skeleton as a whole is imbedded in and is anchored bythe material filling the interstices or openings of the skeleton and practically flush as to its upper or wear surface with the wear edge of the; skeleton.

The special object of my invention is to cheapen the production of skeleton metal work or reenforcement from sheet metal strips or bars and is especially useful in the case of skeleton metal work or reenforce- Inent produced from strips or bars bent and united at their bends to form the open work structure. V I

My invention is carried out by dividing a strip of metal of the desired gage for stiff ness on what may be conveniently described as alongitudinal zigzag line, the effect being to produce two strips from a single strip, each section having a substantially flat or uniform edge and an indented edge forming, as to the projecting portions thereof,

50 means for supporting the skeleton upon a suitable foundation.

In carrying out my invention each said section is bent to and fro as will be more particularly hereinafter described and the sec-' tions being placed side by side are united at the said bends to' form four-sided openingswhich may be square or lozenge-shaped or otherwise diversified. The bends maybe formed at points in the strip coincident with the projecting part of each section or at points coincident with the indentations or recesses and the unions between adjoining strips be made in both cases at the bend. In either casethe projectionslon one edge of each strip will afl'ord feet or supports for the reenforcement.

A further feature of my invention relates to the manner of securing adjoining strips together to prevent displacement of the same with relation to one another during the work of embodying the reenforcement as a part of thepavement surface. This partof my invention consists in providing the strips with tongues andslots' alternately at the bends, the tongues onone strip being adapted to enter a slot in the contiguous strip and to be bent down during the assembly of the strips so as to fasten them: together.

The invention further consists in details of construction more particularly hereinafter describedand claimed.

In the accompanying drawings l r r Fig; 1 isa perspective view of "a skeleton grating or reenforcement embodying my invention.

Fig. 2 illustrates the manner of subdividing a metal baror strip' to form two comp1e-, mentary' bars each adapted for use in build ing: upthefgra-tin'g.

Fig't3' illustrates inperspective one of the longitudinal sections of a bar or strip bent preparatory to assembly andiunion with the complementaryor' othersu'b di-vision bent as shown in Fig. 4. V

F ig. 4: illustrates in perspective the complementary elementbe'ntto' be assembled with the bar disclosed iii-Fig; i

Fig. 5 i's a vertical section through adjoining members at the points of bend and union. a r

Fig. 6 is a perspective view of a modification in which the bends of the divisions are formed to coincide with the recess or indentati'on in the edge and the projecting portion of the edge lies along the side of the opening and furthershows a modification in the manner of fastening adjoining strips together by bars placed against the lower edge coincid'ently withsaid recesses.

7 shows in perspective a bar or strip and the manner Off-SUb-d'iI/idilig the same to form a pair of: strips each adapted for use in making the grating orskeletonreenforcement Fi 6. i V

Fig; 8 shows a bent portion of one of said strips as-bent preparatory to assembling and building'up Fig. 9'is avertical cross-section through the grating or reenfor'cement' Fig. 6 at the point of; union between-the strips.

Fig. 10 illustrates in perspective a modification in the manner of utilizing the two longitudinal sections of a bar or strip as com ponent parts of a grating in which the projecting portions of each strip form feet or supports, and the bent portions of the skeleton reenforcement comprise a strip of uniform width which is bent and interposed between and united at the bends withthe sections of strip to providea skeleton grating relation to the surface filling. Furthermore in which the openings are of modified form.

Referring first to Fig. 2, there is shown in full lines one end of a strip of metal 1 which, for the purpose of myinventionfI divide longitudinally on the continuous dotted line 2 that may be roughly described as a zigzag line serving to form from'the single strip 1 two similar stripseach of which is continu ous at one edge coinciding with the outer edge of the undivided strip and as to its other edge has projections. 3 and indentations or recesses 4 which are complemental in that they are correspondingly shaped and proportioned. 1 7

Whensaidsections or divisions are reversed in position to bring the straight or undivided edges in the same plane andthe strips are bent ontransverse lines 5 to the formsindicatedrespectively in Figs. 3 and 4 and are assembled in contact with one anotheratthe bends as shown in Fig. 1 there results a skeleton-structure having a continuous or unbroken upper edge and a broken lower edge the projections of which afford feet or supports for the grating orskeleton. .The intermediate parts of each strip are, as shown, of arch shape and'afford by. the arch the necessary strengthbetween the pointsof unction of the strips themselves. I

In practice it isdesirable to transport the divisions to the place of use and there assemble them, for which purpose the bending may be done at the place of manufacture of the elements and the strips nested andxso transported. In order to afford means for readily uniting the elements or building up the skeleton structure at the place of use I provide slots 6 and struck-up tongues 7 formed in the strips at their alternate bends respectively so that, upon bringing the strips together when placed in the relation indicated by Figs. 3 and 4: taken together, the tongue 7 of one strip may enter. the slot. 6 of the adjoining strip and be thereafter struck with atool to bend it down asshown in'Figs. .1 and -5thereb-y effectually preventing either part from being raised independently of the other. By this feature of my, invention the buildmg up of the skeleton reenforcement is par.- ticularly facilitated at the place-of use as for instance when it is desired to use a skeleton as a component part of the surface of a 1 pavement wherein the continuous upper edge forms a wear; surface in conjunction with the filler or composition, whetherv asphalt, 001.1-

crete or other material, filled in and upon the skeleton or in which it is forcibly imbedded. In either case, as will be well understood by those skilled in the art, any superfluous material is struck off the upper surface to provide a uniform wear surface.

The skeleton thus constructed will be effectuallysupported by the projections 3 upon its sub-foundation or base and will be prevented from being displaced vertically with the surface material in which it is imbedded will be effectually prevented from creeping or sidewise displacement by the projecting The union of the strips into a complete 1 ing or skeleton reenforcement as indicated in Fig. 6 results in the reenforcement in which the projecting portions of thecut edge of the strip indicated at 3 form the feet or supports for the skeleton while the narrower portions attheir places of incidence are in this instance fastened together and strengthened by transverse rods 8 welded or otherwise secured to their edges and as illustrated more in detail in Fig- 9.. f 1 The projections 3 forming the feet located between junctions act, as before explained, as a support fixing the level of the skeleton and also resist creeping or displacement of. the material in which theskeleton is imbedded.

Fig.10 shows how the component'parts or sub-divisions of a divided strip like that of Fig. 2 or Fig. 7 may be utilized without bendduce a skeleton reenforcement which will be useful and effective in its location of use. What I claim as my invention is:

1. A- skeleton grating or reenforcement built up of. sections of a plate, each section be-. ing continuous or straight on one edge and having complemental projections and intervening recessions at its opposite edge, said plate sections being of general zigzag form throughout their length with the portions thereof having said projections arranged in substantially parallel planes connected by obliquely arranged portions of said plate provided with said recessions, the parallel portions of said plate being attached together.

2. A skeleton grille, grating or reenforcement consisting of strips of metal rigidly secured together at spaced points thereon, said strips of metal being formed on one edge with a succession of complemental indentations and projections, said projecting portions affording in the completed grating feet or proj ections for supporting the reenforcement out of contact with a base and serving likewise as a means for preventing the shifting of the, structure in the plane of the reenforcement and additional strengthening members extending across and being rigidly connected to said metal strips.

3. A skeleton grating or reenforcement formed of a series of strips or bars of metal each indented at one edge and substantially straight at the other, said members being bent laterally to the plane of the strip and rigidly secured together at their bends to form successions of openings, the indented edges of said strips or bars extending downwardly to form the support for said grating or reenforcement.

4. A skeleton grating or reenforcement comprising alternately bent strips secured together at the apexes of the bends therein, said strips being provided with tongues and slots alternately at the bends to facilitatethebuilding up of the reenforcement in the location of use by entering the tongues and bending them down in the slots, said strips being formed with upper surfaces arranged in one plane and with lower surfaces cut away on zigzag lines forming alternate projecting supporting feet and cut-away recesses forming a means of communication between successive pockets formed between said strips.

5. A skeleton metallic framework formed of metal strips provided on one edge with alternate projections and indentations and on the other edge with substantially straight surfaces, said strips in the completed grating being of zigzag form and secured together at spaced points thereon uniformly selected with respect to said projections and indentations to form a skeleton framework having one face arranged in one plane and the other face provided with uniform and complemental projections and indentations forming alternate feet and transverse passages.

Signed at New York in the county of New York and State ofNew York, this 27th day of December, A. D. 1929.

MAURICE LACHMAN. 

